Treebeard: The Wise and Ancient Ents of Middle-earth

In the context of J.R.R. Tolkien's Middle-earth legendarium, Treebeard is a name given to several characters:

1. Treebeard (Fangorn) - A giant ent, one of the oldest and wisest of the tree-beings in Middle-earth. He is a central character in The Lord of the Rings and plays a significant role in the story.
2. Treebeard (Treebeard the Younger) - A younger ent who is a companion of Fangorn and appears in The Lord of the Rings.
3. Treebeard (Treebeard the Elder) - An even older ent who is mentioned in The Silmarillion as one of the ents who lived during the First Age of Middle-earth.

All three of these characters are known for their wisdom, knowledge, and love of trees and nature. They are all depicted as being very tall and having long beards, which gives them their name.